Release v0.6.52: add Arc tool to screenshot editor

Release/README.md

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 # Latest Windows release
 
-## v0.6.51 — 2026-11-06
+## v0.6.52 — 2026-11-06
 
 ## Changes
-- Add Telegram Web K chat language profiles in Google Chrome. Open a chat at `https://web.telegram.org/k/`, then **Settings → Languages → Languages for a chat...** and select **Telegram Web: name**. Choose languages, then **Use languages → Save**. Applies to Alt+Shift, Win+Space, reverse Win+Shift+Space and Next layout.
-- Read the trusted Telegram address and chat header through Chrome accessibility. Refresh on foreground/focus and address/header events, without OCR, a polling timer or a browser extension. Web profiles are separate from Telegram Desktop profiles; identical chat names across accounts/browser profiles share a web profile. Web A and other browsers are not advertised as supported. Telegram Desktop and Teams remain unchanged; Viber OCR remains disabled.
-- Add application-specific snippets. In **Tools → Snippets**, enable **Only in these applications**, enter comma-separated executable names or select an open application and choose **Add app**. Unchecked means everywhere. Matching ignores case and the optional `.exe` suffix. Chrome scope applies to the whole browser.
-- Prefer an application-specific snippet over a global snippet with the same trigger. Allow the same trigger in disjoint application scopes and reject overlapping scopes. Keep existing snippets global. Preserve scopes in manual import/export and synchronization, with scope-aware merge conflicts. Validate the target application before insertion.
-- Center **Add app** against its application selector.
+- Add **Arc (U)** to the screenshot editor toolbar, with its own cursor and drawing hint. Drag a rectangle to draw an open half ellipse; the endpoints are not joined by a straight chord.
+- Resize arcs using the corner handles, rotate them with the round handle (Shift snaps to 15 degrees), move or clone them, and adjust their color, thickness and line style. Undo/redo, connector attachment and full-resolution PNG export preserve the open curve.
+- Widen the editor's minimum window width to fit the additional toolbar button.
+- Retain v0.6.51 Telegram Web K chat profiles in Chrome and application-specific snippets, including their compatibility requirements below.
 
 ## Validation
-Passed 674 chat-profile/snippet UI checks, 568 input checks (including app-specific precedence and global fallback), 108 sync checks, 332 native checks, complete dictionary equivalence (140,939 words), wheel, StayHere, Utilities, screenshot UI/save/registration, 54 updater checks and updater progress checks. Inspected the snippet editor at 250% scaling. Live Chrome checks read a Telegram chat name directly and observed cache activation/invalidation. Release binaries, package manifest, published assets and update selection are checked during publication.
+Passed 332 native checks, 568 input checks, 674 chat-profile checks, 108 sync checks, dictionary equivalence (140,939 words), wheel, StayHere, Utilities, screenshot UI/save/registration, 54 updater checks and updater progress checks. Arc checks cover toolbar selection, drawing, open-curve hit testing and rendering, resizing, rotation, connector attachment, undo/redo and PNG export. Inspected an actual editor rendering with the Arc tool selected. Published package checksums, manifests, executable versions, update selection and English/Ukrainian Wiki pages are verified during publication.
 
 ## Upgrade and compatibility
 Choose **Update** in the tray menu. Legacy v0.3.0–v0.4.1 clients first receive the v0.4.2 compatibility bridge, then the current full release. v0.2.3 and earlier require manual installation.

Release/SHA256SUMS.txt

@@ -1 +1 @@
-0ee6426bf1715ee3156a1f8dbb2d213a9e09a49b2fcfec553d6049dc6a868877  KSwitcher-win-x64.zip
+fdc093c4a45c55fcee7ae4c9b597d56ea95293bd8995ed84cc2c0460e8855d58  KSwitcher-win-x64.zip